Sure Prof. Lewandowsky understands German perfectly well.
Since this is a blog post in WWW, one might read the above in English as well.
Here it is:

Dear Prof. Lewandowsky,

nice to see You here. I have a question for you:
I firmly believe in the moon landing and 9/11th.
And even though I am a smoker, I still think this is very harmful.
Only, I belong to the climate change deniers.
Here is the question:
At what mental illness do I suffer now?
Would be nice if you could help me here, so I can seek professional help.
Greetings from Nuremberg.

PS @ Prof. Lewandowsky:

This was perhaps a bit too tight. For remote diagnosis, I mean.
To my person: Male, Over 60, Having even grandchildren, divorced and now living alone.
Aryan but with crooked nose. Love the capitalism.
Like to eat meat and to drink a beer or few.
And yes, I am a smoker of course.

I hope you can offer some help so that I can be cured from above referred mental illness.